分析带式输送机直接起动速度不稳定的机理,指出额外提供加速度所需的动转矩是造成起动不稳定的主要根源.应用液体黏性软起动装置,可保证起动稳定性,根据软起动装置工作原理,提出采用局部线性化处理,建立软起动装置的数学模型,并求解其传递函数.针对系统中参数的摄动和不确定性,设计了一种模糊PID控制器.利用其参数自整定功能来保证调速系统的稳定性.应用Matlab中的Simulink工具箱进行仿真实验.结果表明,当系统传递函数发生变化时,模糊PID控制效果很好,适应能力很强、响应较快、鲁棒性好,保证了系统的调速特性.

The mechanism of speed instability involving belt conveyor directly starting is analyzed, that the dynamic torque needed for additional acceleration is the main reason for starting instability is pointed out. By applying the hydro-viscous soft starting device to the starting of belt conveyor is able to ensure starting stability. According to the working principle of soft starting device, through the local linear processing, the mathematical model of soft starting device is built, and its transfer function is solved. Aiming at the perturbations and uncertainty of system parameters, a method of fuzzy PID controller is designed. The stability of the speed regulation system is ensured by using the self-tuning function. The simulink toolbox of Matlab is used to conduct the simulation experiment. The results show when the system transfer function changes, the fuzzy PID has a better adaptive capacity, faster response, better robustness, and is able to assure that the system obtains good speed regulation characteristics.